why does mine chirp intertmittently

If it is a 9 volt battery, it may not be seated correctly. See the video on the first alert website, and be prepared to do some hard pushing to get the 9V battery to engage. I had 3 9V units, and 2 of the 3 seemingly required excessive pressure to get the batteries to engage. When I first thought I had the batteries installed by just closing the door, the unit chirped until I got the batteries shoved on hard.

Will the unit work without a bettery in it?

I'm putting these units into rentals. Will this work without a battery in it? If the battery runs low, the tenants usually take the whole unit down rather than change the battery - rendering the whole concept useless. This is the reason I would like to invest in "plug-in" units. However, somewhere it said it will chirp if battery is missing. Please clarify. I need a unit that will be effective, even without a battery installed.

Does the monitor plug directly into the wall socket or is there an electric cord?

No cord. The alarm plugs in directly to the outlet.

At what level of co does this alarm sound? Thank you for your time.

The following info is verbatim from the instructions that came with the unit: Actuation of the Alarm indicates the presence of carbon monoxide which can kill you. In other words, when our CO Alarm sounds, you must not ignore it! The following is not verbatim but a summary of regulatory requirements. Levels of CO that cause an alarm: at 400 ppm of CO, it must alarm between 4 and 15 minutes; at 150 ppm of CO, it must alarm between 10 and 50 minutes; at 70 ppm of CO, it must alarm between 60 and 120 minutes. The unit is designed not to alarm when expose to a constant level of 30 ppm for 30 days. Hope this has answered your question....from housewife1.

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First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605

First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605

Product ID: 289635423

Details

Brand
First Alert
Colour
white
Item weight
4.2 Ounces
Power source
Battery
Style
Compact

⚡Plug-in design for effortless installation

🔋Battery backup for power outage safety

🧪Electrochemical sensor for top accuracy

€ 141.75

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Description

🚨 Stay ahead of danger with smart, seamless CO protection!

SMART SILENCE - Mute nuisance alarms with a single button—peace of mind on demand
PLUG PROTECT - Instant setup with simple plug-in design—no tools needed
TRUSTED LEGACY - From First Alert, a brand with decades of proven home safety
PRECISION DETECTION - Advanced electrochemical sensor ensures reliable CO monitoring
UNINTERRUPTED SAFETY - Battery backup keeps you protected even during power failures

The First Alert CO605 is a compact, plug-in carbon monoxide detector featuring an electrochemical sensor for superior accuracy. Equipped with a battery backup, it guarantees continuous protection even during power outages. Designed for easy installation and user-friendly operation, this UL-listed alarm from a trusted brand offers reliable, long-lasting safety for your home.

Specifications

ASIN	B000ND74XA
Alarm	Audible
Brand	First Alert
Built-In Media	Alarm, Battery
Color	white
Colour	white
Customer Reviews	4.7 out of 5 stars 19,196 Reviews
Enclosure Material	Plastic
Global Trade Identification Number	00029054000682
Item Type Name	CO Alarm
Item Weight	4.2 Ounces
Item weight	4.2 Ounces
Manufacturer	First Alert
Mfr Part Number	FATCO605
Model Number	CO606
Number of Items	1
Power Source	Battery Powered
Power source	Battery Powered
Product Style	Compact
Sensor Type	Electrochemical
Style	Compact
UPC	029054000682
Unit Count	1.0 Count

Reviews

L**K

This is a budget friendly plug-in carbon monoxide detector

This is a budget friendly plug-in carbon monoxide detector. It from a reputable brand that is super easy to use. I have had first alert smoke and carbon monoxide detectors in my home for many decades, so when my CO detector "expired" I replaced it with another detector from first alert. I haven't had any problems or false alerts as can sometimes happen with cheap detectors. In fact, I liked this CO detector & the price point so much that I bought a couple extra to spread throughout the house. The fact it has a battery backup is essential as it gives protection even during power outages. I'm very happy with my purchase.

4.09.2026

G**S

Solid brand and quality

We've been in our house for 20 years and frankly these sorts of devices simply wear out over time. They are must have to keep your family safe and I've used this brand consistently and it works great.

24.08.2026

A**R

Good product

Easy to set up

20.08.2026

J**S

Inexpensive peace of mind

It's a "gotta have it" protection necessary when you live in an older home. Too bad they only last 5+ years but, they're inexpensive and worth the peace of mind.

25.08.2026

C**Y

Safety

I have bought this one before, but lost it in my move. I found it after unpacking. This is a great tool to have for piece of mind in your home! Catherine

1.08.2026

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€ 141.75

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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